Microsoft Copilot (Microsoft 365): GPT-5 in Agent Builder inside Microsoft 365 Copilot

🚨 The Signal: Microsoft 365 Copilot now allows building GPT-5 powered agents. This significantly increases the potential for autonomous actions and data access, demanding immediate review of agent governance and data permissions to prevent security risks.

The Impact

Security teams and administrators are affected by the increased risk of data exfiltration and unauthorized actions by autonomous agents.

• Security teams face new risks from autonomous agents accessing sensitive data.
• Administrators must manage new agent identities and their permissions.
• Data owners risk unintended data exposure through agent actions.
• Compliance officers need to assess new audit trails for agent activities.

The Action

1. Review and update Microsoft 365 Copilot governance policies for agent creation and deployment.
2. Implement strict data access controls and least privilege principles for agent identities.
3. Establish an approval workflow for new agent deployments within Microsoft 365 Copilot.
4. Monitor agent activity logs for anomalous behavior and unauthorized data access.
5. Educate users on responsible agent creation and data handling within Copilot.

Domain: Agentic-AI · Impact: high · Workload: Other · Essential Eight: Restrict Administrative Privileges · ISM: ISM-0445, ISM-1175, ISM-1380, ISM-1507, ISM-1508, ISM-1509, ISM-1647, ISM-1648, ISM-1650, ISM-1686, ISM-1688, ISM-1689, ISM-1883, ISM-1897, ISM-1898